Variable gun choke



April 5, 1949. v .J. c. HILBRN 2,45604 vggnmpf: cHoKE .Filed June 27.1957

Attorneys Patented Apr. 5, 1949 Jbcph @adamant Application allunelk -1 Claimscribed and claim Y.

It -obiectthe present invention to pro- Vide an attainment .which may She quickly and easily adapted "to a gun barrel and which will provide ga variably :adjustable .choke therefor.

i Another object of the inventionzis :the lpro-- vision of an adjustable .choke for shot guns and .y

the like wherein provision is made for the escape of 'gasses when thegun is iired.

further vcvlctauf thei-nvention is the v proiiision r`o f an adjustable .choke for shotgunswhere- 1,11.: provision. is made for a. forward sightfor'the ,Killifurther yobject of the invention is the provisignof ,Ingalls whereby very lf'ne adjustments may be made in an adjustable choke for shotguns and the like.

Other and further objects of the invention will become apparent from a reading of the following 'specication taken in conjunction with the draw ings, in which:

Figure 1 is a plan view of an embodiment of the invention,

Figure 2 is a vertical sectional view of Figure 1,

Figures 3, 4 and 5 are elevational views of elements oi the invention,

Figure 6 is a sectional view taken along line 6--5 of Figure 4, and

Figure 7 is a sectional view taken along line 1-'I of Figure 2.

Generally, the invention provides a device v)which may be readily attached to the barrel of a shotgun and comprising three principal parts, namely, a choke sleeve adapted to be threada-bly attached to the nozzle of a shotgun and havingla plurality of longitudinally extending slots in its Iforward end, an actuating sleeve threadably en- Y 'gaged with lthe choke sleeve and an adjusting 'sleeve threadably engaged with the actuating f sleeve and having a tapered inner face adapted to engage the outer end of the choke sleeve to move the slotted portions thereof inwardly. Provision is made for a forward sight to be carried by the adjusting sleeve which sight is provided with an inwardly extending detent adapted to engage in one of the slots whereby the sight will be held against rotary motion when the choke is adjusted. Referring now more particularly to the drawings, there is shown therein a gun barrel Ill to which is threadably connected, as indicated at I I,

. the internally threaded rear end of a choke sleeve (ClrdzwB-f) r2 vM? Awhich 4is l-providedat its outer end with a plurality of longitudinally .extending slots I3 land with .aftapered rorwardfend I4.

"lntegrallyformed in the choke sleeve I21ad- .jacent the rear end-thereof is algas escape cylin-v der Ivhavinga -fpl-mality of spaced internally formed-annuiar 'grooves i6 each having a plural-ity of r spaced yopenings vI 'l interconnecting 'the same and the-outerfperiphery lof the cylinder I5. Forwardly of the-cylinder I5, thechokesleeve |12 is provided with a right-handed vexternally threaded portion I8 which is adapted to engage ytheYinternally threaded portion I9 of the rear end of an actuating'sleeve V2li which is provided centrally with -a left-handed `externally threaded portion 2i :andwhose' for-ward'end is provided with a;series of .longitudinali-y.extending slots 22 and which is exteriorly tapered, as indicated at723. The actuating sleeve is provided with a knurled 20 portion 24 adjacent the rear end of the same.

An adjusting sleeve is internally threaded, as shown at 26, and is adapted to engage the threaded portion 2l of the actuating sleeve 20 and is provided with a tapered forward end 21 25 having a flattened step 28 formed therein, the inner side of the step 28 being adapted to engage the forward untapered portion of the choke sleeve which is provided with an inwardly extending dog 33 which is adapted to positively engage in a groove i3.

In operation,k it will be apparent that by revolving the actuating sleeve in one direction by placing the lingers upon the knurled portion 24 thereof, that the actuating sleeve will be caused to move rearwardly and the adjusting sleeve likewise will be caused to move rearwardly. When the actuating sleeve is revolved in the opposite direction, the same will move outwardly from the barrel Ili and outwardly upon the choke sleeve I2 and, at the same time, the adjusting sleeve 25 will be caused to move outwardly of the choke sleeve.

During these movements, the inner end of the detent 3|' will be moved from one to another of the slots I3 latching but not locking the actuating sleeve 20, the forward and rearward movementV of the adjusting sleeve thus caused will cause the tapered end 23 to come into contact with the inf. ner side of the tapered portion 21 of the adjust-' ing sleeve, thus causing the forward end of the choke sleeve to contract, due to the pressure of the underside of the forward end of the actuating sleeve thereon. end I of the choke sleeve will come into contact with the inner side of the tapered portion 21 and be caused to contract. Thus, two elements cause the contraction of the forward end of the choke sleeve and -a consequent changing of the pattern of shot propelled from the gun. The grooves i6 and openings l1 provide for the escape of the gases of combustion when the gun is red.

While but one form of the invention has been shown and described herein, it will be readily apparent to those skilled in the art that many minor modications may be made without departing from the spirit of the invention or the scope of the appended claim.

Nhat is claimed is:

A device of the character described coin--V prising a tubular choke sleeve having its rear end portion internally threaded for removable engagement with a gun barrel, said sleeve having its front end externally tapered and being formed with longitudinally extending circumferentially `justing sleeve fitting about the choke sleeve forwardly of the actuating sleeve and having internalthreads in its rear portion engaging the left lhand threads of the actuating sleeve and its for- "ward portion internally tapered for applying com- At the same time, the tapered REFERENCES ct'rED The following references are of record in the le of this patent: i

UNITED STATES PATENTS Number Name Date 618,901 Peterson Feb. 7, 1899 '785,972 McClean Mar. 28, 1905 1,598,360 Pavek Aug. 31, 1926 1,892,522 White Dec. 27, 1932 2,153,246 Gibson Apr. 4, 1939 2,428,232

Limon Sept. 30, 1947` 

